JPH07262544A - Recording and reproducing device - Google Patents

Abstract

PURPOSE:To ensure enhanced reproducing efficiency and a reduced cost for a recording and reproducing device with a head positioned to the track of a recording medium by open loop control. CONSTITUTION:The reading/writing head 21 of a magnetic head 27 used for a floppy disk device is composed of a core 22, a yoke 24 and a gap 23 for reading/writing. The width of the gap 23 is made close to the track pitch length of a floppy disk.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing apparatus having a head which is positioned on a track of a recording medium by open loop control.

In the floppy disk device as a recording / reproducing device, the track position accuracy and the specifications of each operating life are determined in consideration of various use environments, but the MTBF (mean failure time rate) is higher than before. Along with the decrease, the rate of failure of Fiedre is drastically reduced due to the mechanism improvement. This is because the usage is changed due to the small capacity and low price of the floppy disk, which is an exchangeable medium.
It is assumed that the environment for installation was established from the usage environment that emphasized compatibility, and the usage environment with wide range, frequency, and compatibility was almost eliminated.

That is, the price of the floppy disk is reduced,
Due to changes in the operating environment, it has been particularly desired to reduce the price of the floppy disk device.

[0004]

2. Description of the Related Art FIG. 6 is a block diagram of a magnetic head used in a conventional floppy disk drive. FIG. 6A is a perspective view of the core portion of the main part of the recording head, and FIG.
Shows a front view of the magnetic head and a bottom view of FIG.

In FIG. 6A, a read / write head 11 is constructed by winding a coil 11c around a read / write core 11b having a read / write gap 11a in the width direction of the medium contact surface, and media movement indicated by an arrow. Two erase cores 14 having erase gaps 13a, 13a on both outer sides of the read / write head 11 with respect to the direction.
a and 14b are arranged. In this case, the read / write gap 11a and the erase gaps 13a and 13b are displaced in the medium moving direction, and the read / write gap 1
1a is arranged at a position ahead in the traveling direction. A coil 15 is wound around the erase cores 14a and 14b in common to form an erase head 16.

Then, as shown in FIGS. 6 (B) and 6 (C), it is embedded in a slider 17 made of ceramic,
The magnetic head 18 is configured. In this case, a groove 17b is formed between the contact surface 17a of the slider 17 and the medium contact surface of the read / write head 11 (erase head 16) to reduce the influence of air resistance.

Such a magnetic head 18 is arranged, for example, on both sides (upper and lower) of a double-sided recording medium medium (floppy disk) with a shift corresponding to several tracks.

Here, FIG. 7 shows an explanatory view of a conventional track arrangement. In FIG. 7, on the recording surface of the floppy disk 19, in order to guarantee data compatibility, each track 1
Data is recorded with a track width slightly narrower than the pitch between 9a (pitch of track width centers N + 1, N, N-1).

Further, if the magnetic head 18 has no offset, only the read / write head 11 may be used, but since positioning is performed by open loop control, it has some off-track with respect to the track center. In order to guarantee each data interval even when there is,
Immediately after recording in the read / write gap 11a, both sides of the recorded portion are erased by the erase gaps 13a and 13b. For example, track density 48 TPI
According to the magnetic head 18 of the floppy disk device, the track width (recording / reproducing width) is 0.30 mm (read / write gap width 0.33 mm) for a track pitch of 0.529 mm, and the track pitch is 0.265 mm for 96 TPI. Track width is 0.155mm
(Read / write gap width 0.165).

[0010]

However, the track width is related to the magnetization distribution, and when the erase head 16 is provided to narrow the track width, the noise characteristic is improved, but the reproducing efficiency is lowered and the magnetic head 18 is reduced. There is a problem that the off-track allowable range becomes narrow.

In the floppy disk device,
The magnetic head 18 for recording and the spindle motor for rotationally driving the floppy disk occupy a high ratio in the product cost, and particularly the magnetic head 18 requires processing accuracy and high-adhesion technology to reduce the cost. However, it is difficult to deal with the problem, and on the other hand, there is a problem that the cost increases when trying to use the special parts.

Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a recording / reproducing apparatus for improving the reproducing efficiency and reducing the cost.

[0013]

In order to solve the above-mentioned problems, according to a first aspect of the present invention, there is provided a recording / reproducing apparatus in which a head for recording / reproducing information on / from a track of a recording medium is positioned by open loop control. The head is wound around the core portion, in which a gap is formed at a predetermined position where a magnetic path is formed to generate a magnetic field on the recording medium to record / reproduce information. A coil to which a current is supplied to form a magnetic path, and a slider section in which only the core section around which the coil is wound are attached and which makes the gap substantially uniformly contact the recording medium are provided. According to another aspect of the present invention, the recording width of the gap with respect to the track of the recording medium is formed so as to approximate the track pitch length of the recording medium.

[0014]

As described above, in the first aspect of the invention, the head positioned by the open loop control is formed with only the gap for recording / reproducing the core portion attached to the slider portion. As a result, the erase head is omitted, and a sophisticated bonding process is not required, so that the cost can be reduced.

According to the second aspect of the invention, the gap width of the head is formed so as to approximate the track pitch length. As a result, the recording width is widened, a large reproduction output can be obtained, the reproduction efficiency is improved, and thereby the off-track allowable range can be expanded.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a main configuration of an embodiment of the present invention. FIG. 1 is a configuration diagram of a magnetic head used in a floppy disk device as a recording / reproducing device and positioned on a predetermined track of a floppy disk as a recording medium by open loop control. A)
Is a perspective view of the read / write head, FIG. 1B is a front view of the magnetic head, and FIG. 1C is a bottom view of the magnetic head.

In FIG. 1A, the read / write head 21 has a core 22 having a U-shape, a gap 23 formed at one end, and a yoke 24 attached thereto by an adhesive or the like. 25 is wound. The core 22 and the yoke 24 are made of, for example, a soft magnetic material such as Mn—Zn ferrite, and a glass member is appropriately provided in the gap 23. The core 22 and the yoke 24 form a core portion.

Further, the recording width of the gap 23 (width of the core 22 and the yoke 24) is formed so as to approximate the track pitch length of the applicable floppy disk. For example, as applied to a 3.5-inch floppy disk with a track density of 135 TPI, a track pitch of 187.5 μ
The gap width is about 160 μm with respect to m (previously 115 μm
m). This gap width corresponds to about 80% of the track pitch.

Therefore, as shown in FIGS. 6B and 6C, the read / write head 21 is embedded in and attached to a slider 26 formed of ceramic or the like, and a magnetic head 27 is constructed as a head. It The slider 26 is for making the medium contact of the gap 23 substantially uniform.
In this case, a groove 26b is formed between the contact surface 26a of the slider 26 and the medium contact surface of the read / write head 21 in which the gap 23 is formed to reduce the influence of air resistance.

Therefore, FIG. 2 shows a schematic configuration of a floppy disk device to which the magnetic head of FIG. 1 is applied. Figure 2
FIG. 2A is a schematic configuration diagram of the main part of the chassis part, FIG.
(B) is a schematic side view of a head carriage portion.

In FIG. 2 (A), the floppy disk device 31 is provided with a spindle motor 33 for rotating the floppy disk on the chassis portion 32. The floppy disk is fitted on the rotary shaft 33a and the drive pin 33b is engaged. Rotate by combining.

On the other hand, a head carriage mechanism 34 is arranged at the rear of the chassis 32. In the head carriage mechanism 34, as shown in FIG. 2B, the magnetic head (S0 side) 27 _S0 is arranged on the tip of the carriage base 35, and the carriage base 35 and the torsion spring 36 are arranged.
A magnetic head (S1 side) 27 _s1 is arranged to face the magnetic head 27 _S0 on the lower surface of the tip of the upper arm 37 which is rotatable via the head arm. In this case, the read / write heads 21 _S0 and 27 _s1 are at positions displaced by several tracks from the floppy disk (described later). Further, an extension portion 38 extending from one side portion of the carriage base 35 is engaged with a ball screw 40 rotated by a stepping motor 39. Carriage base 35
The other side portion of is engaged with the guide portion 41. In addition, 42 in FIG. 2B is a cover.

FIG. 3 shows a block diagram of the head carriage shown in FIG. 3 (A) is an overall perspective view, FIG. 3 (B)
Shows an assembly configuration diagram of the upper arm, and FIG. 3C shows an assembly configuration diagram of the carriage base 35.

As shown in FIG. 3 (A), (B) , the upper arm 37 has a mounting plate 37a, whereas the magnetic head 27 _S1 which is contained in the ferrite ring 52 for shielding is mounted on the upper gimbal 51 tip And is located on the lower surface of the tip of the upper arm 37. And the upper arm 3
The shield piece 53 is attached to the upper surface of the tip of the shield 7.

Further, as shown in FIGS. 3 (A) and 3 (C),
A shield piece 54 is attached to the tip of the carriage base 35, and the lower gimbal 5 is mounted on the shield piece 54.
The tip portion of 5 is attached. This Roa Gimbal 55
The magnetic head 2 is installed above the ferrite ring 56.
7 _S0 is installed. Reference numeral 57 in FIG. 3C is an engaging portion that engages with the guide portion 41.

The mounting plate 37a of the upper arm 37 is mounted on the base of the carriage base 35,
As shown in FIG. 3A, the upper arm 37 is biased downward by the torsion spring 36.

Therefore, when the floppy disk is inserted, the magnetic heads 27 _S0 and 27 _S1 are brought into contact with both surfaces of the medium.

Next, FIG. 4 shows a configuration diagram of the magnetic head and track arrangement in the present invention. FIG. 4 shows, for example, both sides of a 3.5-inch floppy disk 61 having a track density of 135 TPI, and the magnetic head 27 _{S0 on the} side S0 surface.
Read / write head 21 _S0 (gap 2
3 _S0 ), and the read / write head 21 _S1 (gap 23 _S1 ) in the magnetic head 27 _S1 is attached to the side S1 surface.
Are contacted with each other to record / reproduce information.

In this case, as described above, the gap 2
Since the widths of 3 _S0 and 23 _S1 are formed so as to approximate the track pitch, the recording width (data width) becomes wider than in the past, and the distance between adjacent tracks is made minute. That is, when the data width is expanded, the reproduction output increases (proportional relationship) accordingly. Generally, if the erase head is omitted and the data width is close, the noise characteristics will deteriorate due to the influence of the adjacent magnetization distribution, but due to changes in the operating environment due to the current price reduction of floppy disks, the data characteristics will be better than the noise characteristics. It is becoming more important to increase the width and improve the regeneration efficiency.

Therefore, by omitting the erase head as in the present invention, the data width can be expanded to obtain a large output, the reproduction efficiency can be improved, and the cost can be reduced (down 33% from the conventional one). Can be planned. Further, the allowable range of off-track can be expanded.

Therefore, FIG. 5 shows a graph comparing the reproducing characteristics of the magnetic heads. FIG. 5A shows the reproduction characteristics when the conventional erase heads 14a and 14b (FIG. 6) are provided, and the reproduction output decreases when off-tracking in the arrow direction.

Further, FIG. 5B shows the reproduction characteristic when the erase head of the present invention is omitted and the gap width is enlarged, and the reproduction output without off-track is only the amount of the gap width enlarged. Get higher Therefore, even when the off-track is made in the direction of the arrow, the reproduction output similarly decreases, but the off-track amount until the reproducible output decreases is shown in FIG.
This is expanded from (A), and the off-track allowable range is expanded. Also in the present invention, the width at maximum output is made slightly narrower than the gap width to reduce the influence of adjacent tracks.

For example, as described above, the gap width is about 1
When it is set to 60 μm, the off-track allowable range can be expanded by about 50% as compared with the conventional gap width of about 115 μm.

An erase head is not provided in a magnetic head used in a hard disk drive or the like. However, since the off-track correction is performed by the feedback loop control for the positioning of the magnetic head, the erase head is basically required. Absent. However, like the floppy disk drive, when the magnetic head is positioned by the open loop control by the stepping motor 39, an off-track is generated to some extent, and an erase head is required. The erase head is omitted. Therefore,
INDUSTRIAL APPLICABILITY The present invention can be applied to another recording / reproducing apparatus in which the head is open-loop controlled.

[0035]

As described above, according to the first aspect of the invention, the head positioned by the open loop control is formed with only the gap for recording / reproducing the core portion attached to the slider portion. As a result, the erase head is omitted and a high-level bonding process is not required, so that the cost can be reduced.

According to the second aspect of the invention, by forming the gap width of the head so as to approximate the track pitch length, the recording width for the conventional erase is widened, and high output can be obtained by that amount. The reproduction efficiency is improved, and thus the off-track allowable range can be expanded.

[Brief description of drawings]

FIG. 1 is a main configuration diagram of an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a floppy disk device to which the magnetic head of FIG. 1 is applied.

FIG. 3 is a configuration diagram of the head carriage of FIG.

FIG. 4 is an explanatory diagram of a magnetic head and a track arrangement according to the present invention.

FIG. 5 is a graph comparing output characteristics of magnetic heads.

FIG. 6 is a configuration diagram of a magnetic head used in a conventional floppy disk device.

FIG. 7 is an explanatory diagram of a conventional track arrangement.

[Explanation of symbols]

 21 read / write head 22 core 23 gap 24 yoke 25 coil 26 slider 27 magnetic head 31 floppy disk device 33 spindle motor 34 head carriage mechanism 35 carriage base 36 torsion spring 37 upper frame 39 stepping motor 40 ball screw 51 upper gimbal 55 lower gimbal 61 floppy disk

Claims (2)

[Claims] 1. A recording / reproducing apparatus in which a head (27) for recording / reproducing information on / from a track of a recording medium (61) is positioned by open loop control, wherein the head (27) has a magnetic path formed therein. A core portion (22, 24) in which a gap (23) for recording and reproducing information is generated by generating a magnetic field on the recording medium (61) at a predetermined position. A coil (25) wound around the coil (24) and supplied with an electric current to form the magnetic path, and the core portion (22, 24) around which the coil (25) is wound.
Only the recording medium (6) is attached to the gap (23).
(1) A slider part (26) that makes a substantially uniform contact with
A recording / reproducing apparatus comprising: 2. The recording width of the gap (23) with respect to the track of the recording medium (61) is defined by the recording medium (6).
The recording / reproducing apparatus according to claim 1, wherein the recording / reproducing apparatus is formed so as to approximate the track pitch length of 1).